Is there any difference between the types of inverters used in grid-tied and off-grid systems?

What are some recommendable brands/products for each application?

  • The working principle of inverters is the same regardless of application: they convert DC power to AC power. The main operational difference when using inverters in grid-tied and off-grid systems is:
    -Grid-tied systems feed the output of the PV array directly into the inverter. DC voltage ratings of these inverters may go up to 600 Volts, even in small PV systems.
    -Off-grid systems must first convert the DC output to a voltage which is suitable for charging batteries, such as 24V or 48V. Any inverter used for this application must be able to operate with smaller input voltages.

    Some suitable products for off-grid PV systems are:
    Radian Series by Outback Power, which offers hybrid operation for stand-alone and grid-tied systems alike.
    Sunny Island Series by SMA. It can be considered a version of the Sunny Boy for off-grid systems.

    With respect to grid-tied systems, some good options are:
    SMA Sunny Boy string inverter
    Enphase microinverter
    Solaredge string inveters with DC optimization

  • ConextTM SW is perfect for off-grid, backup power and self-consumption applications, it is a pure sine wave, hybrid inverter system with switchable 50/60 Hz frequencies, providing power for every need.
  • The inverter used in off grid system directly supply the loads, so there is no such critical situation to control the frequency and the voltage levels. but in case of on grid inverter in order to match with the grid parameters( voltage and frequency) the inverter needs to have controller circuit in it.
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